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You searched for: subject:"long duration"
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[image]Tomato Seeds for LDEF - NASA/Langley Research Center
Tomato seeds are prepared for their launch aboard the Langley's Long Duration Exposure Facility. -- Photograph published in Winds of Change, 75th Anniversary NASA publication (page 119), by James Schultz.
Keywords: LONG DURATION EXPOSURE FACILITY. -- SPAC
Downloads: 10
[image]Tomato Seeds for LDEF - NASA/Langley Research Center
Tomato seeds are prepared for their launch aboard the Langley's Long Duration Exposure Facility. -- Photograph published in Winds of Change, 75th Anniversary NASA publication (page 119), by James Schultz.
Keywords: LONG DURATION EXPOSURE FACILITY. -- SPAC
Downloads: 15
[image]Long Duration Balloon Facility - NASA
Standing in front of the Long Duration Balloon Facility are ATIC lead scientist Joachim Isbert and NASA engineer Tia Ferguson. In December 2007 and January 2008, NASA's Columbia Scientific Balloon Facility in Palestine, Texas, launched and recovered three high-altitude balloons from the Antarctica facility.
Keywords: Long Duration Balloon Facility; What -- Columbia
Downloads: 21
[texts]Meteoroid and Debris Impact Features Documented on Long Duration Exposure Facility (FOIA)
A report on meteoroid and debris impacts experiments conducted by the Meteor and Debris Special Investigation Group (M&D SIG) in the Long Duration Exposure Facility (LDEF) while at the Kennedy Space Center. Report includes findings and documentation of impacts of micrometeoroids and debris, discussion of impact morphology and thermal blanketing. Released by Clifford Stone through the Freedom Of Information Act.
Keywords: meteoroid; debris; impact; documented; long duration
Downloads: 47
[texts]Ion-exchange hollow fibers - NON
An ion-exchange hollow fiber is prepared by introducing into the wall of the fiber polymerizable liquid monomers, and polymerizing the monomers therein to form solid, insoluble, cross-linked, ion-exchange resin particles which embed in the wall of the fiber. Excess particles blocking the central passage or bore of the fiber are removed by forcing liquid through the fiber. The fibers have high ion-exchange capacity, a practical wall permeability and good mechanical strength even with very thin wa...
Keywords: PACKAGING; FILMS; FOOD PROCESSING; COATINGS; LONG DURATION SPACE FLIGHT; PERMEATING
Downloads: 83
[audio]Ananta - Inside My Room, Watching The Rain [rain018] - Ananta
"One day I was sitting in my room, watching the rain through the window. It was late afternoon, quite dark around. The drops were hitting the glass from the outside - for me it was only a rumbling. I also heard a subtle drone but I couldn't think a way where it comes from. There should be only silence around but I still heard these drones. Was it in my head? One important thing: that rain lasted four hours...
Keywords: ambient; soundscape; atmosphere; rain; field recordings; abstract; long duration; minimal
Downloads: 6,435 5.00 out of 5 stars5.00 out of 5 stars5.00 out of 5 stars5.00 out of 5 stars5.00 out of 5 stars(4 reviews)
[texts]Learning Sequences of Actions in Collectives of Autonomous Agents - Turner, Kagan
In this paper we focus on the problem of designing a collective of autonomous agents that individually learn sequences of actions such that the resultant sequence of joint actions achieves a predetermined global objective. We are particularly interested in instances of this problem where centralized control is either impossible or impractical. For single agent systems in similar domains, machine learning methods (e.g., reinforcement learners) have been successfully used...
Keywords: BONE DEMINERALIZATION; MUSCULOSKELETAL SYSTEM; LONG DURATION SPACE FLIGHT; BONES; COMPUTER TECHNIQUES
Downloads: 67
[texts]Operational Experience with Autonomous Star Trackers on ESA Interplanetary Spacecraft - Lauer, Mathias
Mars Express (MEX), Rosetta and Venus Express (VEX) are ESA interplanetary spacecrafts (S/C) launched in June 2003, March 2004 and November 2005, respectively. Mars Express was injected into Mars orbit end of 2003 with routine operations starting in spring 2004. Rosetta is since launch on its way to rendezvous comet Churyumov-Gerasimenko in 2014. It has completed several test and commissioning activities and is performing several planetary swingbys (Earth in spring 2005, Mars in spring 2007, Ear...
Keywords: EDUCATION; LONG DURATION SPACE FLIGHT; PSYCHOLOGICAL EFFECTS; SPACE PSYCHOLOGY; SPACE FLIGHT TRAINING; STRESS (PSYCHOLOGY); TRAINING ANALYSIS
Downloads: 62
[texts]Development of the Earth's early crust: Implications from the Beartooth Mountains - Mueller, P. A.
The Beartooth Mountains of Montana and Wyoming are one of several major uplifts of Precambrian rocks in the northwestern of the Wyoming Province. The range is composed of a wide variety of rock types which record a complex geologic history that extends from early ( 3400 Ma) to late (approx 700 Ma) Precambrian time. The Archean geology of the range is complex and many areas remain unstudied in detail...
Keywords: HUBBLE SPACE TELESCOPE; LONG DURATION EXPOSURE FACILITY; SPACE SHUTTLES; TRAINING DEVICES; DRAWINGS; STRUCTURAL ENGINEERING; TORUSES
Downloads: 144
[texts]Are Wolf-Rayet Stars the Progenitors of Long Duration Gamma Ray Bursts? - Patrick Bruskiewich
A paper prepared for a graduate level astrophysics course in November 2005 that looks at whether the demise of huge, short lived Wolf-Rayet Stars are the progenitors of long duration Gamma Ray Bursts (LDGRB).
Keywords: Wolf-Rayet Stars; Long Duration Gamma Ray Bursts; Eddington Limit; simple model
Downloads: 142
[texts]Synoptic and chemical evolution of the Antarctic vortex in winter and spring, 1987 - Tuck, A. F
The dynamical evolution of the vortex at least up to 50 mb is dominated by synoptic scales in the troposphere. In particular, there is a clear response when poleward extension of tropospheric anticyclones from latitudes of 40 and 50 S to 70 and 80 S occurs. This response is evident in isentropic potential vorticity maps, TOMS ozone fields and SAM II polar stratospheric clouds. An important feature of the high latitude Southern Hemisphere lower stratosphere is a transition at potential temperatur...
Keywords: COSMONAUTS; INTERNATIONAL COOPERATION; MIR SPACE STATION; U.S.S.R. SPACE PROGRAM; LONG DURATION SPACE FLIGHT; SPACEBORNE EXPERIMENTS; WEIGHTLESSNESS
Downloads: 17
[texts]Effect of Processing and Subsequent Storage on Nutrition - Perchonok, Michele
The objective of this research is to determine the effects of thermal processing, freeze drying, irradiation, and storage time on the nutritional content of food, to evaluate the nutritional content of the food items currently used on the International Space Station and Shuttle, and to establish the need to institute countermeasures. (This study does not seek to address the effect of processing on nutrients in detail, but rather aims to place in context the overall nutritional status at the time...
Keywords: BED REST; MENTAL PERFORMANCE; LONG DURATION SPACE FLIGHT; HEAD DOWN TILT; ASTRONAUT PERFORMANCE; AEROSPACE MEDICINE; INTERNATIONAL SPACE STATION; TESTS; PSYCHOPHYSIOLOGY
Downloads: 31
[texts]A Bell-Curved Based Algorithm for Mixed Continuous and Discrete Structural Optimization - Kincaid, Rex K.
An evolutionary based strategy utilizing two normal distributions to generate children is developed to solve mixed integer nonlinear programming problems. This Bell-Curve Based (BCB) evolutionary algorithm is similar in spirit to (mu mu) evolutionary strategies and evolutionary programs but with fewer parameters to adjust and no mechanism for self adaptation. First, a new version of BCB to solve purely discrete optimization problems is described and its performance tested against a tabu search c...
Keywords: AEROSPACE ENVIRONMENTS; SOLAR CELLS; SPACECRAFT CHARGING; SPACECRAFT DESIGN; DAMAGE; ENVIRONMENT EFFECTS; EXPOSURE; LONG DURATION EXPOSURE FACILITY; ADHESIVES; INDUSTRIES; MANAGEMENT; PAINTS
Downloads: 56
[movies]NASA Connect - BHFSTE - Exercise In Space - NASA LaRC Office of Education
NASA Connect Segment explaing how astronauts exercise in space and how they endure long-duration space flights. The video also explores ways of measuring levels of fitness.
Keywords: NASA Connect; Microgravity; Space; Weight Training; Long-Duration Space Flight; Astronauts; Fitness; Muscle Atrophy; Bones; Muscles; Health Risk
Downloads: 107
[movies]J-2X Powerpack Test Lights Up the Night
In a brief but dazzling display, a 1.86-second burst of flame emerges from the A-1 test stand at Stennis Space Center as NASA kicks off the first in a series of J-2X powerpack tests the evening of Feb. 15. (NASA/SSC)
Keywords: Marshall Space Flight Center; J-2X rocket engine; Powerpack; Stennis Space Center; space exploration; long-duration missions
Downloads: 30
[movies]NASA Destination Tomorrow - DT18 - Long Duration Space Travel - NASA LaRC Office of Education
Third segment of NASA Destination Tomorrow episode 18 explaining the challenges that astronauts face with prolonged exposure to the space environment. This segment also explores issues such as radiation, gravity, duration of missions and food supply.
Keywords: NASA Destination Tomorrow; Astronauts; Long Duration; Orlando Figueroa; Tonya; Propulsion Technology; Kera O'Bryon; Steele McGonegal; Episode 18; DT18
Downloads: 128
[texts]Investigation of air transportation technology at Ohio University, 1990-1991 - Lilley, Robert W
The status of the Joint University Program is given. Brief synopsis of some areas of research follow. The study of spectrum efficient methods for transmitting weather information to aircraft has resulted in definition of an improved amplitude and phase modulation process which permits reutilization of voice channels for both voice and data. The system is being implemented for testing. Multisensor navigation systems introduce increased flexibility and performance for aviation, at the expense of i...
Keywords: DATA REDUCTION; LONG DURATION EXPOSURE FACILITY; POSTFLIGHT ANALYSIS; THERMAL ANALYSIS; THERMAL ENVIRONMENTS; ATMOSPHERIC BOUNDARY LAYER; ATMOSPHERIC TEMPERATURE; TEMPERATURE MEASUREMENT
Downloads: 52
[texts]Maximum predictive power and the superposition principle - Summhammer, Johan
In quantum physics the direct observables are probabilities of events. We ask how observed probabilities must be combined to achieve what we call maximum predictive power. According to this concept the accuracy of a prediction must only depend on the number of runs whose data serve as input for the prediction. We transform each probability to an associated variable whose uncertainty interval depends only on the amount of data and strictly decreases with it...
Keywords: ALUMINUM; STAINLESS STEELS; BAUXITE; BERYLLIUM ISOTOPES; CONTAMINATION; LONG DURATION EXPOSURE FACILITY; MASS SPECTROMETERS; RAIN; SHAFTS (MACHINE ELEMENTS); SOILS
Downloads: 76
[texts]Ensemble Data Mining Methods - Oza, Nikunj C
Ensemble Data Mining Methods, also known as Committee Methods or Model Combiners, are machine learning methods that leverage the power of multiple models to achieve better prediction accuracy than any of the individual models could on their own. The basic goal when designing an ensemble is the same as when establishing a committee of people: each member of the committee should be as competent as possible, but the members should be complementary to one another...
Keywords: BONE DEMINERALIZATION; WEIGHTLESSNESS; PUBLIC HEALTH; LONG DURATION SPACE FLIGHT; AEROSPACE MEDICINE; BONE MINERAL CONTENT; ASTRONAUTS; LUMBAR REGION; MUSCULOSKELETAL SYSTEM; PELVIS
Downloads: 87
[texts]Infrared power cells for satellite power conversion - Summers, Christopher J
An analytical investigation is performed to assess the feasibility of long-wavelength power converters for the direct conversion of IR radiation onto electrical power. Because theses devices need to operate between 5 and 30 um the only material system possible for this application is the HgCdTe system which is currently being developed for IR detectors. Thus solar cell and IR detector theories and technologies are combined...
Keywords: EXPOSURE; CORRECTION; NEUTRONS; HALF LIFE; LABORATORIES; LONG DURATION EXPOSURE FACILITY; METALS; RADIATION MEASUREMENT; SELF ABSORPTION; SPACELAB; ABSORPTIVITY
Downloads: 87
[texts]Saturn 5 launch vehicle flight evaluation report: AS-508 Apollo 13 mission - NON
No Abstract Available
Keywords: ACCUMULATORS; THERMOMETERS; COSMIC RAYS; LONG DURATION EXPOSURE FACILITY; NUCLEI; DIELECTRICS; ETCHING; HIGH RESOLUTION; METAL FOILS; SODIUM HYDROXIDES
Downloads: 449
[texts]Robotic lunar surface operations: Engineering analysis for the design, emplacement, checkout and performance of robotic lunar surface systems - Woodcock, Gordon R
The assembly, emplacement, checkout, operation, and maintenance of equipment on planetary surfaces are all part of expanding human presence out into the solar system. A single point design, a reference scenario, is presented for lunar base operations. An initial base, barely more than an output, which starts from nothing but then quickly grows to sustain people and produce rocket propellant. The study blended three efforts: conceptual design of all required surface systems; assessments of contem...
Keywords: LONG DURATION EXPOSURE FACILITY; RADIATION DOSAGE; SPACECRAFT DESIGN; CHRONOLOGY; DEPLOYMENT; SPACE STATION FREEDOM; SPACECRAFT COMPONENTS; SPACECRAFT CONSTRUCTION MATERIALS
Downloads: 150
[texts]AMCC casting development, volume 2 - NON
PCC successfully cast and performed nondestructive testing, FPI and x-ray, on seventeen AMCC castings. Destructive testing, lab analysis and chemical milling, was performed on eleven of the castings and the remaining six castings were shipped to NASA or Aerojet. Two of the six castings shipped, lots 015 and 016, were fully processed per blueprint requirements. PCC has fully developed the gating and processing parameters of this part and feels the part could be implemented into production, after ...
Keywords: CRATERING; HYDRODYNAMICS; IMPACTORS; PREDICTION ANALYSIS TECHNIQUES; SCALING LAWS; ALUMINUM; LONG DURATION EXPOSURE FACILITY; TEFLON (TRADEMARK); TERMINAL BALLISTICS
Downloads: 150
[texts]Recent Single Event Effects Results for Candidate Spacecraft Electronics for NASA - O'Bryan, Martha V.
Vulnerability of a variety of candidate spacecraft electronics to proton and heavy ion induced single event effects is studied. Devices tested include digital, linear bipolar, and hybrid devices.
Keywords: ROBOTICS; SYSTEMS ENGINEERING; MANNED SPACE FLIGHT; SPACE EXPLORATION; LONG DURATION SPACE FLIGHT; SYSTEMS INTEGRATION; SITUATIONAL AWARENESS; RISK
Downloads: 93
[texts]Mission Medical Information System - Johnson-Throop, Kathy A.
This viewgraph presentation gives an overview of the Mission Medical Information System (MMIS). The topics include: 1) What is MMIS; 2) MMIS Goals; 3) Terrestrial Health Information Technology Vision; 4) NASA Health Information Technology Needs; 5) Mission Medical Information System Components; 6) Electronic Medical Record; 7) Longitudinal Study of Astronaut Health (LSAH); 8) Methods; and 9) Data Submission Agreement (example).
Keywords: INTERNATIONAL SPACE STATION; LEG (ANATOMY); BONE MINERAL CONTENT; LONG DURATION SPACE FLIGHT; MUSCULOSKELETAL SYSTEM; PHYSICAL EXERCISE; ASTRONAUTS; COUNTERMEASURES; WEIGHTLESSNESS; BONE DEMINERALIZATION; TREADMILLS
Downloads: 20
[texts]Develop advanced nonlinear signal analysis topographical mapping system - Jong, Jen-Y
The SSME has been undergoing extensive flight certification and developmental testing, which involves some 250 health monitoring measurements. Under the severe temperature pressure, and dynamic environments sustained during operation, numerous major component failures have occurred, resulting in extensive engine hardware damage and scheduling losses. To enhance SSME safety and reliability, detailed analysis and evaluation of the measurements signal are mandatory to assess its dynamic characteris...
Keywords: LONG DURATION EXPOSURE FACILITY; SATELLITE ATTITUDE CONTROL; SPACECRAFT STABILITY; SPACEBORNE EXPERIMENTS; BERYLLIUM ISOTOPES; CHEMICAL TESTS; KAPTON (TRADEMARK); METAL FILMS; OXYGEN ATOMS; POLYMERIC FILMS; REACTION KINETICS
Downloads: 63
[texts]The flow of a viscous rarefied gas around a flat half infinite plate - Bunimovich, A. I
No Abstract Available
Keywords: STELLAR CORONAS; X RAY ASTRONOMY; X RAY ASTROPHYSICS FACILITY; GRAZING INCIDENCE TELESCOPES; HEAO 2; IMAGE PROCESSING; LONG DURATION SPACE FLIGHT; SPECTROSCOPY
Downloads: 66
[texts]Quantum Mechanical Study of Nanoscale MOSFET - Svizhenko, Alexei
The steady state characteristics of MOSFETS that are of practical Interest are the drive current, off-current, dope of drain current versus drain voltage, and threshold voltage. In this section, we show that quantum mechanical simulations yield significantly different results from drift-diffusion based methods. These differences arise because of the following quantum mechanical features: (I) polysilicon gate depletion in a manner opposite to the classical case (II) dependence of the resonant lev...
Keywords: LONG DURATION SPACE FLIGHT; IN SITU RESOURCE UTILIZATION; MATERIALS RECOVERY; LOW EARTH ORBITS; FUEL PRODUCTION; OXIDIZERS; MARS MISSIONS; LUNAR EXPLORATION; OXYGEN PRODUCTION
Downloads: 95
[texts]NASA Marshall Space Flight Center Solar Observatory report, July - October 1993 - Smith, J. E
This report provides a description of the NASA Marshall Space Flight Center's Solar Vector Magnetograph Facility and gives a summary of its observations and data reduction during June-October 1993. The systems that make up the facility are a magnetograph telescope, an H-alpha telescope, a Questar telescope, and a computer code.
Keywords: HISTORIES; SUPERSONIC AIRCRAFT; WIND TUNNELS; LUNAR ORBITS; NASA PROGRAMS; ORBITAL RENDEZVOUS; SCOUT LAUNCH VEHICLE; SPACE FLIGHT; LANDMARKS; LONG DURATION EXPOSURE FACILITY; SPACE SHUTTLES
Downloads: 47
[texts]Dependence of the multiplicities of secondary particles on the impact parameter in collisions of high-energy neon and iron nuclei with photoemulsion nuclei - Dudkin, V. E.
A method is proposed for finding the dependence of mean multiplicities of secondaries on the nucleus-collision impact parameter from the data on the total interaction ensemble. The impact parameter has been shown to completely define the mean characteristics of an individual interaction event. A difference has been found between experimental results and the data calculated in terms of the cascade-evaporation model at impact-parameter values below 3 fm.
Keywords: DATA BASES; DATA PROCESSING; EXTRATERRESTRIAL RADIATION; LONG DURATION EXPOSURE FACILITY; RADIOACTIVITY; EARTH ORBITAL ENVIRONMENTS; GAMMA RAY SPECTRA; LOW EARTH ORBITS; NUCLIDES
Downloads: 87
[texts]Are the virial masses of clusters smaller than we think - Cowie, L. L.
The constraints that the available X-ray spectral and imaging data place on the mass distribution and mass to light ratio of rich clusters are considered. It was found for the best determined cases that the mass to light ratio is less than 125 h sub 50 at radii exceeding 1 h sub 50 Mpc. The mass to light ratio is approximately constant at radii exceeding 1 h sub 50 Mpc but may rise to values of roughly 200 h sub 50 in the central regions...
Keywords: COST ANALYSIS; SPACECRAFT CONFIGURATIONS; SPACECRAFT PROPULSION; COST ESTIMATES; LONG DURATION SPACE FLIGHT; MANNED MARS MISSIONS; MANNED SPACE FLIGHT; MARS (PLANET); AEROBRAKING; MATHEMATICAL MODELS; MISSION PLANNING
Downloads: 52
[texts]Tandem fan model-front fan nozzle test applicable to a type A V/STOL aircraft - Pennington, David F
No Abstract Available
Keywords: GEOSYNCHRONOUS ORBITS; LONG DURATION SPACE FLIGHT; MANNED SPACE FLIGHT; SPACE STATIONS; SPACECRAFT DESIGN; ARTIFICIAL GRAVITY; ORBITAL MANEUVERING VEHICLES; ORBITAL SERVICING; ROTATION
Downloads: 83
[texts]Transmission diagnostic research at NASA Lewis Research Center - Zakrajsek, J. J.
The NASA Lewis Research Center and the U.S. Army Research Laboratory are involved in a joint research program to advance the technology of aerospace transmissions. Within the last six years, a transmission diagnostics research team was formed to address current and future technology barriers in transmission diagnostics. The diagnostics team conducted a survey to determine critical needs of the diagnostics community...
Keywords: CONFERENCES; PROTECTIVE COATINGS; RADIATION DAMAGE; THIN FILMS; EARTH ORBITAL ENVIRONMENTS; ENVIRONMENTAL TESTS; LONG DURATION EXPOSURE FACILITY; SPACEBORNE EXPERIMENTS; SPACECRAFT CONSTRUCTION MATERIALS; METAL FILMS; OXYGEN ATOMS; POLYMER MATRIX COMPOSITES
Downloads: 78
[texts]Studies of pressure-velocity coupling schemes for analysis of incompressible and compressible flows - Burgreen, Gregory Wayn
Two pressure-velocity coupling schemes, both of which solve the fully implicit discretized equations governing the flow of fluids were examined, and the capability of performing large Reynolds number, low Mach number compressible flow calculations were assessed. The semi-implicit iterative SIMPLE algorithm is extended to handle transient compressible flow calculations. This extension takes into account a strong coupling between the pressure and temperature through a correction procedure, based o...
Keywords: CLOSED ECOLOGICAL SYSTEMS; SPACE COMMERCIALIZATION; SPACE SHUTTLES; SPACE STATIONS; GAS RECOVERY; MATERIALS RECOVERY; RECYCLING; WATER TREATMENT; GENERAL OVERVIEWS; GRAVITATIONAL EFFECTS; JAPAN; LONG DURATION SPACE FLIGHT
Downloads: 217
[texts]Ionene modified small polymeric beads - NON
Linear ionene polyquaternary cationic polymeric segments are bonded by means of the Menshutkin reaction (quaternization) to biocompatible, extremely small, porous particles containing halide or tertiary amine sites which are centers for attachment of the segments. The modified beads in the form of emulsions or suspensions offer a large, positively-charged surface area capable of irreversibly binding polyanions such as heparin, DNA, RNA or bile acids to remove them from solution or of reversibly ...
Keywords: NUTRITION; FOOD INTAKE; RETINENE; ASCORBIC ACID; FREEZE DRYING; FOOD PROCESSING; SPACE FLIGHT FEEDING; STORAGE STABILITY; INTERNATIONAL SPACE STATION; IRRADIATION; LONG DURATION SPACE FLIGHT; THERMODYNAMICS; DEHYDRATED FOOD
Downloads: 83
[texts]Hydrazine decomposition and other reactions - NON
This invention relates to the catalytic decomposition of hydrazine, catalysts useful for this decomposition and other reactions, and to reactions in hydrogen atmospheres generally using carbon-containing catalysts.
Keywords: INTERNATIONAL SPACE STATION; HEALTH; AEROSPACE MEDICINE; MANNED SPACE FLIGHT; SPACE SHUTTLES; LONG DURATION SPACE FLIGHT; SPACECREWS; U.S.S.R. SPACE PROGRAM; CREW EXPLORATION VEHICLE; NUTRITION
Downloads: 107
[texts]Variable length strut with longitudinal compliance and locking capability - NON
A variable length strut device is illustrated for connecting two associated structures which includes an outer load bearing shell, a drive assembly, a length varying compliance assembly positioned by drive assembly, and a strut rod locking assembly. The load bearing shell includes a connecting part adapted for connection to a first associated structure. A strut connection rod has a connecting part adapted for connection to a second associated structure and a distal end having a piston driver sli...
Keywords: HUMAN FACTORS ENGINEERING; PSYCHOLOGICAL FACTORS; LONG DURATION SPACE FLIGHT; MANNED SPACE FLIGHT; PSYCHOLOGICAL FACTORS; SPACECREWS; HUMAN PERFORMANCE; HUMAN REACTIONS; MAN MACHINE SYSTEMS; PSYCHOLOGICAL EFFECTS
Downloads: 54
[texts]Application of the Probabilistic Dynamic Synthesis Method to the Analysis of a Realistic Structure - Brown, Andrew M.
The Probabilistic Dynamic Synthesis method is a new technique for obtaining the statistics of a desired response engineering quantity for a structure with non-deterministic parameters. The method uses measured data from modal testing of the structure as the input random variables, rather than more ''primitive'' quantities like geometry or material variation. This modal information is much more comprehensive and easily measured than the ''primitive'' information...
Keywords: SPACECRAFT CONTAMINATION; PREDICTION ANALYSIS TECHNIQUES; ANODIC COATINGS; PLUMES; IMPINGEMENT; THERMAL CONTROL COATINGS; LONG DURATION EXPOSURE FACILITY; MATHEMATICAL MODELS; TRAYS; SURFACE PROPERTIES; TEFLON (TRADEMARK); SILICONES; ALUMINUM; ADHESIVES
Downloads: 85
[texts]Industry survey of space system cost benefits from New Ways Of Doing Business - Rosmait, Russell L
The cost of designing, building and operating space system hardware has always been expensive. Small quantities of specialty parts escalate engineering design, production and operations cost. Funding cutbacks and shrinking revenues dictate aggressive cost saving programs. NASA's highest priority is providing economical transportation to and from space. Over the past three decades NASA has seen technological advances that provide grater efficiencies in designing, building, and operating of space ...
Keywords: EARTH ORBITAL ENVIRONMENTS; RADIATION DAMAGE; SHORT CIRCUIT CURRENTS; EXTRATERRESTRIAL RADIATION; LONG DURATION EXPOSURE FACILITY; RADIATION EFFECTS; SOLAR CELLS; CARRIER TRANSPORT (SOLID STATE); CURRENT DENSITY; DEGRADATION; DIFFUSION LENGTH
Downloads: 64
[texts]Linear Energy Transfer (LET) spectra of cosmic radiation in low Earth orbit - Parnell, T. A.
Integral linear energy transfer (LET) spectra of cosmic radiation (CR) particles were measured on five Cosmos series spacecraft in low Earth orbit (LEO). Particular emphasis is placed on results of the Cosmos 1887 biosatellite which carried a set of joint U.S.S.R.-U.S.A. radiation experiments involving passive detectors that included thermoluminescent detectors (TLD's), plastic nuclear track detectors (PNTD's), fission foils, nuclear photo-emulsions, etc...
Keywords: CHEMICAL COMPOSITION; SPACECRAFT STRUCTURES; CRATERS; GOLD; ISOTOPES; LOW EARTH ORBITS; EARTH ORBITAL ENVIRONMENTS; ISOTOPIC LABELING; LONG DURATION EXPOSURE FACILITY; MICROANALYSIS; PROJECTILES; RESIDUES; SECONDARY ION MASS SPECTROMETRY; SPACE DEBRIS
Downloads: 91
[texts]Mars Sample Handling Protocol Workshop Series - Nealson, Kenneth H
This report provides a record of the proceedings and recommendations of Workshop 3 of the Series, which was held in San Diego, California, March 19-21, 2001. Materials such as the Workshop agenda and participant lists as well as complete citations of all references and a glossary of terms and acronyms appear in the Appendices. Workshop 3 builds on the deliberations and findings of the earlier workshops in the Series, which have been reported separately...
Keywords: SIMULATION; LONG DURATION SPACE FLIGHT; CONTAMINATION; CHEMICAL COMPOSITION; ASTRONAUTS; ANATOMY; WEIGHTLESSNESS; EDUCATION; AEROSPACE ENVIRONMENTS; AEROSPACE MEDICINE; COMPUTER PROGRAMS; COMPUTERIZED SIMULATION; SPACECREWS; INTERNATIONAL SPACE STATION
Downloads: 75
[texts]Fracture Tests of Etched Components Using a Focused Ion Beam Machine - Kuhn, Jonathan, L.
Many optical MEMS device designs involve large arrays of thin (0.5 to 1 micron components subjected to high stresses due to cyclic loading. These devices are fabricated from a variety of materials, and the properties strongly depend on size and processing. Our objective is to develop standard and convenient test methods that can be used to measure the properties of large numbers of witness samples, for every device we build...
Keywords: MOTION SICKNESS; ASTRONAUTS; NERVES; TACHYCARDIA; VOMITING; LONG DURATION SPACE FLIGHT; ORTHOSTATIC TOLERANCE; PARABOLIC FLIGHT; AUTONOMIC NERVOUS SYSTEM; CARDIOVASCULAR SYSTEM; HIGH GRAVITY ENVIRONMENTS; AIRCRAFT PILOTS
Downloads: 52
[texts]Semiannual report, 1 October 1990 - 31 March 1991 - NON
Research conducted at the Institute for Computer Applications in Science and Engineering in applied mathematics, numerical analysis, and computer science is summarized.
Keywords: AEROSPACE ENVIRONMENTS; SAFETY FACTORS; SPACECREWS; UNIVERSE; AEROSPACE MEDICINE; BIOLOGICAL EFFECTS; LIFE SCIENCES; LONG DURATION SPACE FLIGHT; AERODYNAMICS; AEROSPACE ENGINEERING; GRAVITATIONAL EFFECTS; HEALTH
Downloads: 89
[texts]A Rayleigh-Ritz analysis methodology for cutouts in composite structures - Russell, Steven G
A new Rayleigh-Ritz stress analysis methodology that was developed for composite panels containing cutouts is described. The procedure, which makes use of a general assumed displacement field, accommodates circular and elliptical cutouts in biaxially loaded rectangular composite panels. Symmetric integral padups around the cutout can be included in the analysis. Benchmark results are presented to demonstrate the accuracy of the technique...
Keywords: HYPERVELOCITY IMPACT; TRAILING EDGES; ALUMINUM; FLAKES; GOLD; IMPACTORS; INTERPLANETARY DUST; POPULATIONS; VAPORIZING; LEADING EDGES; LONG DURATION EXPOSURE FACILITY; METAL SURFACES; METEORITE CRATERS; MICROMETEOROIDS; PROJECTILES; RESIDUES; SPACE DEBRIS
Downloads: 195
[texts]Computational Tools and Facilities for the Next-Generation Analysis and Design Environment - NON
This document contains presentations from the joint UVA/NASA Workshop on Computational Tools and Facilities for the Next-Generation Analysis and Design Environment held at the Virginia Consortium of Engineering and Science Universities in Hampton, Virginia on September 17-18, 1996. The presentations focused on the computational tools and facilities for analysis and design of engineering systems, including, real-time simulations, immersive systems, collaborative engineering environment, Web-based...
Keywords: LINEAR ENERGY TRANSFER (LET); ACCURACY; IONIZING RADIATION; LOW EARTH ORBITS; MATHEMATICAL MODELS; RADIATION MEASUREMENT; LONG DURATION EXPOSURE FACILITY; SPACECRAFT ORBITS; PROTONS
Downloads: 176
[texts]Study of chromium-frit-type coatings for high-temperature protection of molybdenum - Moore, D G
The achievement of more compact and efficient power plants for aircraft is dependent, among other factors, on the perfection of heat-resisting materials that are superior to those in current use. Molybdenum is one of the high-melting metals (melting point, 4750 F). It is fairly abundant and also can be worked into many of the shapes required in modern power plants. To permit its widespread use at elevated temperatures, however, some means must first be found to prevent its rapid oxidation...
Keywords: ASTRONAUTS; PREVENTION; PROJECT PLANNING; SPACE SHUTTLES; UNITED STATES; DIETS; METABOLISM; NUTRITION; PHYSICAL EXERCISE; PHYSIOLOGY; SPACE STATION FREEDOM; WEIGHTLESSNESS; LONG DURATION SPACE FLIGHT
Downloads: 62
[texts]Activities relating to understanding the initiation, organization and structure of moist convection in the Southeast environment - Mcnider, Richard T
In the spring and summer of 1986, NASA/Marshall Space Flight Center (MSFC) will sponsor the Satellite Precipitation And Cloud Experiment (SPACE) to be conducted in the Central Tennessee, Northern Alabama, and Northeastern Mississippi area. The field program will incorporate high altitude flight experiments associated with meteorological remote sensor development for future space flight, and an investigation of precipitation processes associated with mesoscale and small convective systems...
Keywords: AEROSPACE SYSTEMS; LOW EARTH ORBITS; SPACECRAFT CONTAMINATION; SPALLATION; DAMAGE ASSESSMENT; EARTH ORBITAL ENVIRONMENTS; HYPERVELOCITY IMPACT; IMPACT DAMAGE; LONG DURATION EXPOSURE FACILITY; METEOROIDS; SPACE DEBRIS; HAZARDS
Downloads: 171
[texts]Liquid Rocket Booster (LRB) for the Space Transportation System (STS) systems study. Appendix F: Performance and trajectory for ALS/LRB launch vehicles - NON
By simply combining two baseline pump-fed LOX/RP-1 Liquid Rocket Boosters (LRBs) with the Denver core, a launch vehicle (Option 1 Advanced Launch System (ALS)) is obtained that can perform both the 28.5 deg (ALS) mission and the polar orbit ALS mission. The Option 2 LRB was obtained by finding the optimum LOX/LH2 engine for the STS/LRB reference mission (70.5 K lb payload). Then this engine and booster were used to estimate ALS payload for the 28.5 deg inclination ALS mission...
Keywords: CHEMICAL COMPOSITION; URINE; WASTE DISPOSAL; WASTE TREATMENT; CONDENSATES; DRYING; FEEDBACK CONTROL; HUMIDITY; PH; WATER; DUST; FECES; HABITATS; HYGIENE; LIFE SUPPORT SYSTEMS; LONG DURATION SPACE FLIGHT; SWEAT; TRACE CONTAMINANTS
Downloads: 92
[texts]System-state and operating condition sensitive control method and apparatus for electric power delivery systems - NON
This invention provides a method and apparatus for determining a precise switching sequence for the power switching elements of electric power delivery systems of the on-off switching type and which enables extremely fast transient response, precise regulation and highly stable operation. The control utilizes the values of the power delivery system power handling network components, a desired output characteristic, a system timing parameter, and the externally imposed operating conditions to det...
Keywords: CARDIOVASCULAR SYSTEM; ECHOCARDIOGRAPHY; BIOMEDICAL DATA; MICROGRAVITY; HEART FUNCTION; IMAGING TECHNIQUES; LONG DURATION SPACE FLIGHT; ULTRASONICS; AEROSPACE MEDICINE; CORONARY CIRCULATION; VALSALVA EXERCISE; INTERNATIONAL SPACE STATION
Downloads: 97
[texts]Oscillating-Flow Regenerator Test Rig: Hardware and Theory With Derived Correlations for Screens and Felts - Gedeon, D.
A number of wire mesh and metal felt test samples, with a range of porosities, yield generic correlations for friction factor, Nusselt number, enhanced axial conduction ratio, and overall heat flux ratio. This information is directed primarily toward stirling cycle regenerator modelers, but will be of use to anyone seeking to better model fluid flow through these porous materials. Behind these results lies an oscillating-flow test rig, which measures pumping dissipation and thermal energy transp...
Keywords: LONG DURATION EXPOSURE FACILITY; DEBRIS; FLAT PLATES; DAMAGE ASSESSMENT; IMPACT DAMAGE; CRATERING; SECONDARY ION MASS SPECTROMETRY; MICROANALYSIS; HYPERVELOCITY IMPACT; SURFACE LAYERS; METAL FOILS; GOLD; QUANTITATIVE ANALYSIS; ALUMINUM
Downloads: 185
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